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參數(shù)資料
| 型號： | LM122H-MIL |
| 英文描述： | Analog Timer Circuit |
| 中文描述： | 模擬定時器電路 |
| 文件頁數(shù)： | 5/14頁 |
| 文件大?。?/td> | 281K |
| 代理商： | LM122H-MIL |
Functional Diagram
TL/H/7768–9
Timing Diagram
TL/H/7768–10
Pin Function Description
One of the main features of the LM122 is its great versatility.
Since this device is unique, a description of the functions
and limitations of each pin is in order. This will make it much
easier to follow the discussion of the various applications
presented in this note.
V
a
is the positive supply terminal of the LM122. When us-
ing a single supply, this terminal may be driven by any volt-
age between 4.5V and 40V. The effect of supply variations
on timing period is less than 0.005%/V, so supplies with
high ripple content may be used without causing pulse width
changes. Supply bypassing on
V
a
is not generally needed
but may be necessary when driving highly reactive loads.
Quiescent current drawn from the
V
a
terminal is typically
2.5 mA, independent of the supply voltage. Of course, addi-
tional current will be drawn if the reference is externally
loaded.
The
V
REF
pin is the output of a 3.15V series regulator refer-
enced to the ground pin. Up to 5.0 mA can be drawn from
this pin for driving external networks. In most applications
the timing resistor is tied to
V
REF
, but it need not be in
situations where a more linear charging current is required.
The regulated voltage is very useful in applications where
the LM122 is not used as a timer; such as switching regula-
tors, variable reference comparators, and temperature con-
5
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| LM123-12 | 制造商:SEME-LAB 制造商全稱:Seme LAB 功能描述:3 AMP POSITIVE VOLTAGE REGULATORS |
| LM123-15 | 制造商:SEME-LAB 制造商全稱:Seme LAB 功能描述:3 AMP POSITIVE VOLTAGE REGULATORS |
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